1.) How does the extinction maximum vary with (a) particle size and (b)
refractive index of the surrounding medium?
2.) What value of the particle size gives the best agreement with your
experimental spectrum of the silver colloid?
3.) Can you match both the width and lmax of the experimental and
theoretical spectrum? If not, propose a possible explanation.
4.) When you make the comparison between your UV-Vis spectrum and the
theoretical calculation, you use the “Extinction Spectrum” which is the
sum of scattering and absorption. Why is this more appropriate than
simply the calculated absorption?
B. T-Matrix Method. The T-matrix method is an exact
technique for simulating light scattering by particle arrays based
on Mie theory for each particle and the translation addition